In the fantasy novels of Rick Cook, a module of the WIZ-DOS magic compiler system that sequenced operations and reported resource conflicts between the three processors that made up the system. Originally written by Karl Dershowitz, the module incorporated a debugging tool that appeared as three small monkeys, representing the three processors. Normally, when things were running smoothly, the monkeys would appear in the classic "hear-no-see-no-speak-no-evil" pose; however, when conflicts turned up in the handling of the request queue, the monkeys would start poking each other's eyes out, bopping each other on the head, and tweaking each other's noses. (To get an idea of what that looked like, examine the acronym for this module carefully.)

Source: Rick Cook, The Wizardry Compiled